38mm Sudco Racing Carb Keihin questions?

I just bought a superjet that was an old race ski. I has a 62t/61x motor this two blue sudco racing keihen carbs(i think 38mm). Anyone know anything about this carbs?

Theres a sticker on them saying sudco, race only carb.
 
I was just wondering if there is an advantage to running these carbs over the stock 38mm mukuni carbs. I was just trying to figure out why someone would buy these carbs and a intake adapter when the engine already came with two 38mm carbs?
 
They are blue, I guess I was wrong, buying 42mm carbs makes more sense! I was told they were 38mm carbs but I can see where the intake manifold was bored out so that makes sense!
Now if I can just figure out why this ski has 6 pissers!
Thanks
 
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